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Gabbro is a dark-colored coarse-grained intrusive igneous rock. The specimen shown above is about two inches (five centimeters) across. Gabbro is a coarse-grained, dark-colored, intrusive igneous rock. It is usually black or dark green in color and composed mainly of the minerals plagioclase and augite. It is the most abundant rock in the deep oceanic crust. Gabbro has a variety of uses in the construction industry.
Silica (SiO2) content - 45%-52%. Uses-as aggregate, fill etc. in the construction and roading industries; cut and polished for dimension stone (called black granite) for building facings, foyers etc. New Zealand occurrences-Northland, sporadic occurrences in the northwest Nelson area, Marlborough and Southland. Gabbro is a dense, mafic intrusive rock. It generally occurs as batholiths and laccoliths and is often found along mid-ocean ridges or in ancient mountains composed of compressed and uplifted oceanic crust.